• Baumann, Dominik
• Huppertz, Hubert
• Seibald, Markus
• Hoerder, Gregor J.
• Volpini, Johannes G.

Abstract

<jats:title>Abstract</jats:title><jats:p>The new quaternary lithogallate Sr<jats:sub>2</jats:sub>LiGaO<jats:sub>4</jats:sub> was prepared by conventional solid-state synthesis in a welded tantalum ampoule at <jats:italic>T</jats:italic> = 850 °C. Single-crystal X-ray diffraction was used to elucidate the crystal structure of the compound, which crystallizes in the orthorhombic space group <jats:italic>Pnma</jats:italic> (no. 62) with the lattice parameters <jats:italic>a</jats:italic> = 11.2434(4), <jats:italic>b</jats:italic> = 5.6879(2), and <jats:italic>c</jats:italic> = 6.6983(2) Å. The phase composition of the powder sample was determined by Rietveld refinement based on X-ray diffraction data. The crystal structure is composed of layers of corner-sharing LiO<jats:sub>4</jats:sub> and GaO<jats:sub>4</jats:sub> tetrahedra with alternating orientation parallel to the crystallographic <jats:italic>bc</jats:italic> plane. The eightfold coordinated strontium atoms are arranged in a zigzag manner between the layers forming two types of double-capped trigonal prismatic SrO<jats:sub>8</jats:sub> units with common faces. The crystal structure of Sr<jats:sub>2</jats:sub>LiGaO<jats:sub>4</jats:sub> is isotypic to that of the lithoaluminate derivate Sr<jats:sub>1.85</jats:sub>Ba<jats:sub>0.15</jats:sub>LiAlO<jats:sub>4</jats:sub>.</jats:p>

Topics

• impedance spectroscopy
• compound
• phase
• x-ray diffraction
• Strontium
• forming
• space group
• tantalum